XML 37 R47.htm IDEA: XBRL DOCUMENT
v2.4.0.6

EMPLOYEE BENEFIT PLANS (Details) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
EMPLOYEE BENEFIT PLANS |  |  |  |
Single Employer Defined Benefit Plan Funded Number | 2 |  |  |
Employee benefit plans |  |  |  |
Target allocation (as a percent) | 100.00% |  |  |
Weighted-average asset allocations (as a percent) | 100.00% | 100.00% |  |
Pension Benefits |  |  |  |
Employee benefit plans |  |  |  |
One year returns (losses) on plan assets (as a percent) | 15.20% |  |  |
Three year returns (losses) on plan assets (as a percent) | 8.40% |  |  |
Five year returns (losses) on plan assets (as a percent) | (0.10%) |  |  |
Long-term average return on plan assets since inception (as a percent) | 8.30% |  |  |
Expected long-term rate of return plan assets (as a percent) | 8.30% | 8.30% | 8.30% | 8.50%
Pension Benefits | Domestic equity securities |  |  |  |
Employee benefit plans |  |  |  |
Target allocation (as a percent) | 53.00% |  |  |
Weighted-average asset allocations (as a percent) | 56.00% | 59.00% |  |
Pension Benefits | International equity securities |  |  |  |
Employee benefit plans |  |  |  |
Target allocation (as a percent) | 15.00% |  |  |
Weighted-average asset allocations (as a percent) | 14.00% | 14.00% |  |
Pension Benefits | Debt securities |  |  |  |
Employee benefit plans |  |  |  |
Target allocation (as a percent) | 22.00% |  |  |
Weighted-average asset allocations (as a percent) | 19.00% | 17.00% |  |
Pension Benefits | Real estate |  |  |  |
Employee benefit plans |  |  |  |
Target allocation (as a percent) | 10.00% |  |  |
Weighted-average asset allocations (as a percent) | 5.00% | 6.00% |  |
Pension Benefits | Other and cash |  |  |  |
Employee benefit plans |  |  |  |
Weighted-average asset allocations (as a percent) | 6.00% | 4.00% |  |

X
- Definition The percentage of five-year returns (losses) on pension plan assets. + References No definition available. + Details
Name: | matx_DefinedBenefitPlanFiveYearReturnOnPlanAssets
Namespace Prefix: | matx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of long-term average return on pension plan assets. + References No definition available. + Details
Name: | matx_DefinedBenefitPlanLongTermAverageReturnOnPlanAssets
Namespace Prefix: | matx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of one-year returns (losses) on pension plan assets. + References No definition available. + Details
Name: | matx_DefinedBenefitPlanOneYearReturnOnPlanAssets
Namespace Prefix: | matx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of three-year returns (losses) on pension plan assets. + References No definition available. + Details
Name: | matx_DefinedBenefitPlanThreeYearReturnOnPlanAssets
Namespace Prefix: | matx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of single employer defined benefit pension funded plans. + References No definition available. + Details
Name: | matx_SingleEmployerDefinedBenefitPlanFundedNumber
Namespace Prefix: | matx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512013 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 + Details
Name: | us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant